I own a custom 60" x 30" x 18" Planet Aquarium peninsula. It is _not_ starfire glass, so I don't know about the added cost on that. I had it drilled 4 holes in one end, to my specs (I sent them an Autocad layout). Blackout that end, rimless, beveled and polished edges... I am _VERY_ happy with my choice. Quality is excellent. I've seen many tanks from the higher end builders, I really don't see any difference.
It wasn't cheap, but it was less than any of the other custom tank makers I talked to... and I talked to a bunch of them. I wanted 30" wide, which ended up costing me dearly, but... that's what I wanted, and I wouldn't have been happy with less. Could have saved a bundle if I'd have been happy with a 24" wide tank.
One you didn't mention is CustomAquariums.com... they have an online price sheet that lets you configure to your heart's content... 60" x 24" x 24" with aluminum frame comes in at $895. Prices are clearly posted, but call and talk to their sales people. Mine knocked off a bit on the price in an effort to get me to sign off on the build. I nearly went that way, but wanted the thicker glass that PA was offering. Prices were within a couple hundred bucks of each other.
PA doesn't deal with the public... you've got to go through a dealer. I was able to work through a friend, and thus able to review the paperwork (yeah, I saw what I was paying the LFS... wasn't enough to make a difference), and I was able to talk to PA themselves. It was a bit of a pain, really... dealing with CustomAquariums.com was easier, their salesperson did his best for me, but I ended up going the other way.